Instrument of binding papers

Abstract: A paper binding instrument including punching edges and auxiliary punching edges, in which the punching edges can make small holes 3 continuing from punched foot parts 1 of a small width and punched head parts of a large width formed at front ends of the head parts, and pushed down head pieces 6 which were the head parts 2 through the sheaf of papers with leaving punched pieces 4 corresponding to the small holes 3 and maintaining base parts of foot pieces 5 corresponding to the foot parts 1, and the auxiliary punching edges can make auxiliary small holes 8 facing in different directions from the facing directions of the small holes 3 formed with the punching edges 7, and as holding auxiliary punched papers corresponding to the auxiliary small holes 8, the auxiliary punching edges push down the front end parts of the auxiliary small holes.

Description: The invention relates to an instrument for binding a plurality of paper sheets according to the preamble of claim 1. Such an instrument is known from EP-A-362 046, which a discloses a punch and chisel, wherein the chisel is provided with a slot, through which the end portion of a punched tongue is inserted by a pivoting finger. Only one tongue is provided, the free end of which is inserted into a slot in the paper sheet cut by the chisel. Typical examples in this kind of paper binding instruments are known as staplers which bind piled papers with metal staples. A novel stapler has recently appeared which can bind papers without using metal staples. This comprises punching edges 7 shown in Fig.8. A sheaf of piled papers 23 is folded at the corners as seen in Fig.7, and the punching edges 7 can make small holes 3 continuing from punched foot parts 1 of small width and punched head parts 2 of large width formed at front ends of the head parts, and pushes down head pieces 6 which were the head parts 2 through the sheaf of papers with holding punched pieces 4 corresponding to the small holes 3 while maintaining base parts of foot pieces 5 corresponding to the foot parts 1. If the punching edges 7 are, as shown in Fig.9, pushed through the sheaf of the piled and folded papers 23, the small holes 3 are formed with leaving the punched pieces 4 as seen in Fig.7, and if the foot parts 1 of the small holes 3 are engaged by the head pieces 6 of the punched papers 4 as if they are jaws thereof, the papers may be bound. With respect to the stapler without using metal staples, the sheaf of papers 23 are folded at the parts to be formed with the holes 3, resulting in a bad external appearance. However, if the sheaf of papers are bound without folding, the punched papers 4 of the upper layer slide along the foot parts of the small holes 3 as ilustrated with an arrow in Fig.11. The present invention is to provide a new paper binding instrument which does not need the folding of the parts to be bound. This object is achieved by the features in the characterizing part of claim 1. The sheaf of papers are bound by catching the jaws of the head pieces 6 of the punched papers 4 in the foot parts 1 of the small holes 3, and the papers are thereby prevented from sliding, so that the end parts of the sheaf 23 of papers does not require folding. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross sectional view of an entire body of the binding instrument; Fig. 2 is a perspective view of the lower end part of the punching means and a receipt part therefor; Fig. 3 is a cross sectional view of an element part showing making of small holes with the punching edges; Fig. 4 is a cross sectional view of an element part showing making of auxiliary small holes with the auxiliary punching edges; Fig.5 is a perspective view showing a sheaf of bound papers; Fig. 6 is a perspective view of a partially enlarged part of a lower surface showing a sheaf of bound papers; Fig. 7 is a perspective view showing a binding of a sheaf of papers by the foregoing stapler; Fig. 8 is a perspective view showing a structure of the punching edge of the foregoing stapler; Fig. 9 is an explanatory view showing the making of a hole in a sheaf of papers by the foregoing stapler; Fig.10 is a perspective view similarly showing making of a hole in a sheaf of papers with the foregoing stapler; and Fig.11 is a perspective view showing the sliding of papers to be bound with the foregoing stapler. In the drawings, 1: foot part, 2: head part, 4: punched paper, 5: foot piece, 6: head piece, 7: punching edge, 8: auxiliary small hole, 9: auxiliary punched piece, 10: auxiliary punching edge, 14: punching metal, 15: spring, 16: axis, 17: projecting part, 18: foot of a narrow and lengthy part, 19: head of a large width. PREFERRED EMBODIMENT OF THE INVENTION An explanation will be made of the preferred embodiment with reference to the attached drawings. The paper binding instrument of the invention is, as seen in Fig.1, mainly composed of a base plate 11, a punching holder 12, a handle 13, a punching metal die 14, and a spring 15. The punching metal 14 is attached to the punching holder 12 in a vertically movable manner and is biased upward by a spring 15. The handle 13 is rotatably mounted on the punching holder 12 around an axis 16, and a projecting part 17 is provided at the inside of the handle 13 and contacts a top of the punching metal die 14. As shown in Fig.2, there are three rows of punching edges 7 on the lower end of the punching metal die 14, and four auxiliary punching edges or cutting heads 10 facing in different directions with respect to the punching edges 7. The punching edge 7 comprises a foot 18 of a narrow and lengthy part and a head 19 of a large width as shaped in an arrow in cross section, in which one side of the head 19 obliquely slants upward. The auxiliary punching edge 10 has a triangled shape at its lower end. A base plate 11 is positioned just under the punching metal 14, and a receipt template 22 is furnished on the base plate 11 and is formed with holes 20, 21 for passing the punching edges 7 and the auxiliary punching edges therethrough. A plurality of the papers 23 are put on the receipt template 22 of the base plate 11, and if the handle 13 is pushed down on the front end in the direction of the arrow seen in Fig.1, the projecting part 17 of the handle 13 pushes down the punching metal 14 due to an action of a fulcrum, and the punching edges 7 and the auxiliary punching edges 10 punch out the sheaf of papers as illustrated in Figs.3 and 4. Thus, the papers 23 are formed with the punched holes 3 and auxiliary punched holes 8 as seen in Figs.5 and 6. The hole 3 comprises the foot part 1 of small width formed by the foot 18 of the punching edge 7 and the head part 2 formed by the head 19 continuing from the foot part 1, and this is shaped almost as an arrow. The auxiliary hole 8 punched out by the auxiliary punching edge 10 is rectangular. Since the punching edge 7 and the auxiliary punching edge 10 slant in the lower end faces and when those edges punch the piled papers, they do not completely cut out the punched papers 4 corresponding to the holes 3 and the auxiliary punched papers 9 corresponding to the auxiliary holes 8, but keep the connecting condition at one end thereof. In other words. the punched paper 4 comprises the foot piece 5 which was the foot part 1 and the head piece 6 which was the head part 2, and the foot piece 5 maintains the connection at its base portion. In addition, the punching edge 7 and the auxiliary punching edge 10 slant in the under end faces, whereby the head piece 6 of the front end of the punched paper 4 and one end of the auxiliary punched piece 9 are pushed down through the lower surface of the sheaf of papers 23. Since the punched papers 4 are moved so that the head pieces slightly slide toward the foot pieces of the small holes 3, the jaws of the head pieces 6 of the upper papers catch the edges of the foot parts 1 of the lower papers. Thus, the upper and lower papers do not separate from each other. Then, if the foot pieces 5 and the head pieces 6 move, the upper and lower papers slide along the length of the foot parts, however in the present invention, the auxiliary holes 8 are made facing in a different direction with respect to the small holes 3, and the auxiliary punched papers 9 are supported in the auxiliary small holes 8, so that sliding as stated above is exactly prevented. INDUSTRIAL APPLICABILITY The present invention is safe in binding papers without using metal staples as in conventional staplers. Further, since the invention does not fold papers at the corner to be bound as in conventional examples, it makes a good external appearance with precise prevention of sliding of the papers.

Claims: Instrument for binding a plurality of paper sheets (23), said instrument comprising a base plate (11), a template (22) mounted on said base plate, a punching holder (12), and a punching die (14) reciprocatingly mounted on said punching holder, said punching die (14) including first and second punching pieces (7, 10) complementary to openings (20, 21) of said template (22), wherein said first punching piece is shaped to form punched paper pieces from said plurality of sheets, each punched paper piece (4) having an elongated form that remains attached to the paper sheet at one end, characterized in that the first and second punching pieces (7, 10) are extending transverse to each other for forming transversely extending first and second punched paper pieces (4, 9) from said plurality of paper sheets when said punching die is moved downwards through said template, wherein each first punched paper piece (4) has an elongated narrow foot portion (5) that remains attached to the paper sheet at one end of the foot portion and has a wider head portion (6) at the opposite end of the foot portion, and wherein said second punching piece (10) is shaped to form second punched paper pieces (9) from said plurality of sheets, each second punched paper piece (9) being substanially rectangular-shaped and remaining attached to the paper sheet at one side edge of the rectangle, said first and second punched paper pieces (4, 9) being punched by the first and second punching pieces through the bottom surface of said plurality of paper sheets in directions substantially transverse to each other. Instrument for binding papers according to claim 1, wherein said first punching piece (7) is in a shape of an arrow with an elongated portion (18) which forms the narrow foot portion and a triangular portion (19) that forms the wider head portion. Instrument for binding papers according to claim 1, wherein said punching die comprises a plurality of said first and second punching pieces (7, 10). Instrument according to claim 1, wherein said punching pieces (7, 10) comprise leading surfaces which are inclined with respect to said template (22).

Inventors: KOBAYASHI EIZO, KOBAYASHI, EIZO
Applicants: SUN STAR STATIONERY CORP, SUN-STAR STATIONERY CORPORATION
Application year: 1994
Main classification: B31F5
IPC codes: B42B5, B31F5, B26F1